Filling valve



www L??? 1956 m. K. GALLOWM FILLING VALVE 4 Sheets-Sheet l Filed Deo. l,1952 IOS FILLING VALVE 4 Sheets-Sheet 2 Filed Dec. l, 1952 mm w Wav MNmo. .WN @mi .Nmy @m .Wmoll \nwm lNvENToR ROBERT K. GLLOVNW ,BY www i/UQWWLW ATTORNEY wv.. 13, 1956 R. K. GALLOWAY UQAM FILLING VALVE FiledDec. l, 1952 4 Sheets-Sheet 3 |77 am, ma, a@ 295 INVENTOR ROBERT M.GIALLOWAY m mw;

ATTORNEY United States Patent O FILLING VALVE Robert K. Galloway,Hoopeston, Ill., assignor to Food Machinery and Chemical Corporation,San Jose, Calif., a corporation of Delaware Application December 1,1952, Serial No. 323,406

2 Claims. (Cl. 222-448) This invention appertains to improvements inmachines for filling containers with fluid. More particularly it relatesto an improved measuring `and filling valve for a filling machine.

In the food canning industry, machines for filling containers areemployed in which liquid is pumped from a central chamber and dispensedthrough filling valves into cans or like containers, the arrangementbeing such that each valve automatically encloses or traps a measuredquantity of liquid which it later discharges into one of a consecutiveline of cans. In such a machine a plurality of cans are successivelyadmitted, are filled as they are advanced through the machine, and areautomatically discharged after they are filled.

It is an object of the present invention to provide a valve for a canfilling machine adapted to accurately measure a desired quantity ofliquid and deliver the measured charge to a can as the can isprogressively moved through the machine.

Another object is to provide a metering type filling valve jhaving meansfor varying the capacity of the valve.

Another object is to provide an efficient actuating mechanism for ametering valve.

Another object is to provide a metering valve that is simple inconstruction and which may be readily disas- :sembled for cleaning.

Another object of this invention is to provide, in a fill- ;ing machine,means for insuring that all valves meter and .discharge identicalquantities of liquid.

Other and further objects and advantages of the pres- (ent inventionwill become apparent from the following detailed description taken inconnection with the accompanying drawings, in which:

Fig. l is a plan view, partly broken away to more clearly disclose theinternal structure of a filling machine incorporating filling valves,and a control system therefor, constructed in accordance with theteachings of the present invention.

Fig. 2 is a vertical section taken along line 2 2 of Fig. 1.

Fig. 3 is a vertical section taken along line 3 3 of Fig. 1.

Fig. 4 is a vertical section taken along line 4-4 of Fig. 1 through thevertical centerline of a novel metering and filling valve of the presentinvention.

Fig. 5 is a vertical section taken along line 5 5 of Fig. 4.

Fig. 6 is a fragmentary `horizontal section taken along line 6 6 of Fig.4.

Fig. 7 is a horizontal section taken along line 7 7 of Fig. 4.

Fig. 8 is a section taken centrally through an air control unit of thepresent invention.

Figs. 9, 10 and ll are fragmentary sections partly broken away, of aportion of the filling machine and particularly illustrating progressivemovements of the novel valve structure during the filling operation.

In Figs. 1 and 2 the reference numeral 14 indicates generally a rotaryfilling machine in which a plurality of novel filling valves of thepresent invention are operatively disposed. Since the operation of thefilling valves is dependent upon the functioning of the other parts ofthe .filling machine to maintain a desired liquid level in the 2,770,404Patented Nov. 13, 1956 ICC supply tank and since the opening and closingof the Valves are coordinated with the operations of the fillingmachine, it will be advantageous to first describe the operation of thefilling machine in general before describing the operation of the valves15.

The filling machine 14 comprises a turret 16 which is rotatably mountedby a bushing 17 and a bearing assembly 18 on a stationary support 19extending upwardly from a rigid base structure 20. The turret 16 has ahub 22 secured by a plurality of capscrews 23 to the fiange of a gear 24which is driven through a suitable transmission 25 from a power drivenshaft 26. The turret 16 has an outer, annular flat supporting platform28 connected to the hub 22 by a generally conical, rigid, drivetransmitting section 29. Supported on the turret 16 .for rotationtherewith is an outer tank 32 formed by a continuous, rigid sheet metalmember including an upright cylindrical wall 34, an annular tank bottom35 and a tank liner portion 36. A cylindrical baffle 38 is supported inupright position in spaced relation above the tank bottom 35 by aplurality of studs 40 (Fig. 2) that are threaded, at one end, into thetank bottom 35 and into the supporting platform 28 of the turret and, atthe other end, are secured, `as by setscrews (not shown) to collars 41welded to the side surface of the baffle. The space between the tankwall 34- and the baffle 3S defines an annular trough 44 into whichliquid is pumped from an inner, stationary, generally conical tank 45 bya power driven pump 46. The pump 46 draws liquid from the inner tank 45through an opening 47 in the slanted bottom wall 43, forces itdownwardly through openings 49a in a stationary plate 49 secured to thesupport post 19 and then upwardly along the tank liner 36, under thebaffle 38 and into the trough 44. When the level of the liquid reachesthe upper edge 50 of the side wall S1 of the inner tank 45, it spillsover the bafiie and is returned to the inner tank 45. The pump 46 hassufficient capacity to keep the trough overflowing at all times and thusthe elevation of the upper edge 50 of the inner tank wall 51 willdetermine the level of liquid in the trough 44, which level determinesthe height to which each valve is filled.

The metering and filling valves 15 are disposed in upright position inthe trough 44, each valve being positioned in an opening 55 (Fig. 4) inthe tank bottom 28 in a manner to be described hereinafter.

Referring lto Fig. 2, it will be seen that a can feeding mechanism 57,of the well known star WheelI type, delivers cans to a can track 58which is mounted immediately below the trough. It will be understoodthat the drive mechanism for the turret Iand the drive mechanism for thecan feeding apparatus may be of any standard type which is arranged sothat the feeding of the cans may be synchronized with the movement ofthe: valves on the turret to position a can directly under each valve.The can track 53 comprises an upright track 59 and a flat, adjustableplate 60 supported on a plurality of brackets 61 secured to a rigidcasing of the machine. This can track is fully disclosed and claimed inmy copending application for patent entitled Tank Construction for aFilling Machine, now Patent No. 2,710,024. The cans are moved along thecan track by a plurality of moving arms 63 (Fig. 2) which embrace eachcan individually and urge it along the track. rIhe arms 63 are mountedon an opstanding rim 64 of a rotatable, annular platform 65 which has aninner, generally cylindrical surface 66 disposed in guided, relativelyrotatable relation around an outer guide surface 67 of a rigid supportring 68. The ring 68, which carries a plurality of rollers 70 on whichthe platform 65 is supported, is secured in fixed stationary positionrelative to the base 20 by a plurality of structural members 72 whichare bolted to the base and to the support ring 68. The platform isdriven by means of' a pin 74 which is rotatably journalled Anear one endin a bossV 75 of the platform and is keyed at the other end in a collar77 integrally formed in a depending position on the conical section 29of theturret 16, lThus, as the turret rotates to Vcarry the trough444arid the valves 15 in a circular path, it also moves the cans along asimilar circular path at thesaine sp'eedby'means of the arms 63 carriedon the platform '65.

Referring to Fig. 4, it will be seen that each valve comprises astationary cylindrical housing 73 secured in ano'pjeningdSS in the. tanksupporting platform "55. The housing 78 has an annular flange 79 at itsupper end. with anouter beveled peripheral surface 7 9a seated in atapered annular 'seat 80 defined by a downwardly inclined portion 81 lofthe tank bottom 35 and by a beveled counterbore inthe platform 28 aroundthe .upper end of the opening 55. A nut 82, 'engaged over a threadedportion 83 on the outer ,surface `of the housing 78, locks `the valvehousing in position. A seal ring 84 is disposed in compressed engagementbetween the flange 79 and the inclined portion 81'01? the trough bottomto insure positive sealing against leakage from the tank. The upper edgeof the opening in the housing 78 Ais counterbored, as at 85, to providea `seat for a seal ring 86. Seated within the seal ring 3e and extendinginto a beveled bore 87 in the housing 78 is an upper movable valve body89 comprising a generally cylindrical lower portion 90 and an uppertubular portion 91 havi`ng a flared section 92 welded to the lowercylindrical portion. ,The lower body portion 90 has a frustoconical ,endsurface 93 adapted -to engage the beveled bore 87 ofthe housing and theseal ring 86 in liquid-tight cn- 'gagement Four 'spaced upstanding vlugs95, secu-red to the; upper end of the housing 78, 'hold the slidableupper valve body in vertical alignment. A bridge 96 is secured acrossthe upper, open end of the valve body 89 to provide a support fory anelongated valve stemt 98 which has La reduced diameter upper end portion99 extending through an opening 100 in the bridge. The valve stem issuspended from the bridge by a capscrew 101 which is threaded into atapped opening in the end of the stem, thevhead'of thev capscrew beingdisposed in overlapping engagement with the ledge 102 formed on thebridge 'V96 around the opening 100 therein.

The lower end of the valve stem is reduced in diameter to form alshoulder 103 against 'which a rigid, cupshaped retainerf104 ispositioned. A rubber valve head 105 is tightly clamped against theretainer by means of a special capscrew106' that'hasl a shankportionthreaded into a tapped opening in the lower endof the valve stemand an enlarged cylindrical body portion 10S that abuts the lower end ofthe rubber valve head'to force the valve head against the retainer 104.A plurality of laterally-extending angularly spaced tins 109 (Fig. 6)are formed on the body 108 to define liquid flow passages between'thefins. The lower ends of the ins are joined by a skirt 11@ vwhich dependsfrom the body portion and has a downwardly andV outwardly sloped outersurface for directing liquid toward the inside walls of t-he cantherebelow.

AA generally cylindrical hollow lower valve body 112 is disposedrforslidable vertical movement in the housing `78 toprovide a closure memberfor the lower end of the housing. This lower valve body 112 has aninner, down- 'wardly converging, surface 113 which terminates at itslower end in a conical valve seat 114. The lower valve body 112 also hasan annular liange 115 projecting outwardly from its outer side wall4into close sliding engagement with an enlarged diameter bore 117 of thehousing `478. Upward movement of the lower valve body 112 is limited bylthe abutment of the upper surface 118 of the flange 115 with a shoulder119 formed in the housing by the enlarged diameter bore 117. Downwardmovement yof the lower valve body is limited by the contact of the theouter wall of the lower valve body 112, the shoulder 119, andthe ange115. Air under pressure may 'oe directed to the chamber 123 above theange 115 by means of a fitting 125 which is connected, as will beexplained presently, to a suitable source of air under pressure andarranged to direct air `to an annular passage 126 formed by an undercutin the housing. A'Ii'tting 127 is arranged to deliver air from a sourceof pressurized air to an annular recess 128 in the housing whichcommunicates with the chamber 123 below the flange 115 of the lowervalve body 112. A resilient seal ring 130 is disposed in a groove 131 inthe iange 115 in air-tight engagement between the walls of the groove131 and the inner wall of the housing. It will therefore be recognizedthat the upper and lower annular surfaces of the flange 115 act aspistons causing the lower valve body 112 to be raised `when air isintroduced into the chamber V123 through'the fitting 127, and causingthe lower valve body 112 to be lowered when air is introduced throughthe'fitting 125.

The retainer ring 122 is held in close iitting engagement in the lowerend of thehousing 78 by means of a bayonet-type connection formed by twodiametricallyopposed tianges 133, Fig. 7, which extend radiallyoutwardly from the ring '122 and project into grooves 134 formed in theinner surface of the housing 78. Seal rings 135 and v136, disposed ingrooves 137 and 138, respectively, in the retainer 122,y prevent t-hepassage of `air downwardly past theretainer 122, while a seal ringdisposed in a groove 141 in the inner wall of the housing '73 preventsthe passage of air upwardly between the housing and the lower valvebody.

It is, of course, necessary that' each valve 15 measures out the samequantity Vof liquid as every other valve. As will be explained morefully in connection with the overall operation of the valve, thequantity of liquid that each valve meters is dependent upon the level ofthe liquid in the trough 44. It will be appreciated that,'since thetrough 44 is constantly rotating with the turret and, since liquid isintermittently drawn from the trough into y'the chamber of an open valvewhen the upper valve body 89 is lifted oif the seat 87, a degree ofturbulence is created in the trough which causes uctuations in theliquid level. To minimize the variations in the amount of liquid trappeddue to uctuations in the liquid level, the diameter of the upper valvebody 89 is reduced in diameter, as seen in Fig. 4. Thus, thecross-sectional area of the internal chamber of the valve body is verysmall at the level corresponding to the liquid level'main- 'tained'inthe trough by the pump 47. This liquid level is indicated in Fig. 4 bythe reference line X. `A further reduction in the cross-sectional areaof the chamber at the fcritic'al'liquid level is attained by adisplacement plugr145 (Fig. 4) which is generally cylindrical'in shapeand has a central longitudinal opening'through which the valve stem 98extends in sliding relation. With this displacement plug in place, thearea of the chamber at the critical level is limited tothe annular spacebetween the plug and the wall of the upper valve body 89. Thedisplacement plug 145 may be adjusted in the chamber by means of a rodm14.6 (Fig. 5) to the lower end of which the plug is suitably secured. Astud 147 is loosely disposed in a lateral opening 148 near the upper endof the valve stem 98. The stud is threaded at one end -to receive a nut149, While the other end is provided with a hole 150 through which therod 146 extends. Tightening of the nut 149will draw the rod 146 againsta grooved washer 151' disposed von thestud to clamp the rod' in anyadjusted position.

In Figs. 9, l0 and ll, the Vvarious positions of the valve during theoperation of the filling machine are illustrated. The aircontrol systembyl which'air is directed either to the lfitting 125 orthe fitting 127is not shown in Figs.' 9, l0 and 11 but will be described-presently. InFig. 9, the valve is shown in the discharge position.` Air has beendirected to the chamber 123 `abovefthe annular flange o'rpiston 115driving the lower valve body downwardly against the retainer ring 122.In this downward movement the valve seating surface 93 of the uppervalve body 89 first comes to rest on the seat 87 of the valve housing78, trapping a quantity of liquid inside the valve. Since the valve stem98 is carried by the-upper valve body, its downward movement is alsoarrested, and further descent of the lower valve body 112 under theiniluence of pressurized air above the piston 115 causes the unseatingof the exible valve head 105 and the d1scharge of liquid into the cantherebelow. After the liquid has been completely discharged from thevalve, air is directed to the fitting 127 to introduce a1r to the lowerside of the piston 115 causing the upward movement of the lowervalvebody 112. As the lower valve body moves upwardly, it seats the rubbervalve head 105 as shown in Fig. l0, and then unseats the Valve seatingsurface 93 of the upper valve body as shown in Fig. 1l. The liquid inthe trough 44 then rushes in to fill the valve so that when the valveseating surface 93 of the upper valve body 89 is returned to engagementwith the seat 87 in the valve housing, as shown in Fig. 9, it will trapa charge of liquid inside the valve. 1n summary, when air is directed tothe upper fitting 125, the filling and metering valve 15 is moved to `adischarge position shown in Fig. 9. When air is directed to the fitting127, the valve is moved to the valve lling position shown 1n Fi ll.

xiieferring to Figs. 2 and 3, it will be seen that the flow of air underpressure to ttings 125 and 127 is controlled by air control units 153and that a separate air control unit 153 is provided for each valve.Each air control unit (Fig. 8) comprises a housing 155 secured to theunderside of the platform 65 (Fig. l) which is rotated by the turret 16.The housing 155 has .a central cylindrical bore 156 (Fig. 8) and tappedopenings 158, 159 and 160 extending through the wall of the housing intocommunication with the central bore 156. A rod 163 is disposed in thebore 156 having a plurality of large diameter cylindrical portions 164in slidable contact with the interior wall of said bore. Grooves 165,formed in said cylindrical portions, receive resilient rings 166 whichsealingly engage the rod and the wall. Reduced diameter portions 163:1,16317 and 163e are formed on the rod between adjacent cylindricalsurfaces and flats 167 are provided on the large diameter portions 164to form annular air passages around the rods `and communicating with thetapped openings 158, 159 and 160, respect'ively. A button 168 is formedon each end of the rod, and snap rings 169 `are disposed in grooves atthe ends of the rod to form retaining shoulders. Nipples 171, 172 and173, are threaded into the tapped openings 158, 159 and 160,respectively, and extend through openings (Fig. 3) in the frame so thatnuts 175 screwed on the outside -of the nipples 171 and 173 serve tosecure the housing 155 to the platform 65. The nipple 171 is connectedto a conduit 177 leading to the fitting 127 that directs air to thechamber 123 below the annular piston 115 of the lower valve body. Thenipple 172 is connected to a conduit 178 leading to a circular header179 that is carried by the platform 65 and supplied with air underpressure from a supply conduit 180 (Fig. 2). The nipp-le 173 isconnected to a conduit182 leading to the fitting 125 that directspressurized air to the chamber 123 above the annular piston 115 of thelower valve body 112.

The rod 163 of each air control unit 153 is actuated by a cam 184 (Figs.1 and 3) which is mounted on the upper end of a vertically movable rod186, for a purpose to be explained presently. The cam 184, which islocated at the valve discharge station A--A (Fig. l) has a fixed cammingsurface 184a inclined inwardly toward the axis of the turret. Thus, withthe turret rotating in a counterclockwise direction, as seen in Fig. l,the rod 163 of each air control unit will be pushed inwardly when thebutton 168 of the rod contacts the inclined surface 184e of the cam. Asseen in Fig. 8, inward movement, or movement to the left, willcommunicate the air inlet nipple 172 with the nipple 173 leading 'to thefitting 125 which is connected to the upper end of the chamber 123 inthe valve 15, and will vent the conduit 171 to atmosphere. Thus, atposition A-A each metering and filling valve 15 is moved to dischargeposition.

The Valve is held lin discharge position for substantially of turretrotation at the end of which the knob at the opposite end of the rod 163in the air control unit 153 is contacted by a cam 188 (Fig. l) locatedat position B-B of the machine. The cam 188 has an inclined cammingsurface 189 formed by one edge of the cam body 190 which is adjustablysecured to a bracket 191 mounted on the stationary support ring 68.Adjustment of the cam relative to the bracket for varying the cam angleis accomplished by capscrews 192 which pass through slots 193 in the cambody and are threadedly engaged in the bracket. When the button 168 ofthe rod contacts the cam 188, the rod is shifted outwardly, or to theright in Fig. 8, communicating the air inlet nipple 172 with the nipple171 leading to the fitting 127 which directs air to the lower end of thechamber 123 and venting the conduit 173 to atmosphere. Thus, at positionB--B the discharge port of the valve is closed, and the filling of theValve is begun and continued until the valve arrives at the dischargeposition A.

if for any reason no can is moved onto the can track below a particularvalve, that Valve will not be opened at the discharge position A. Thisadvantageous arrangement is obtained by mounting the cam 184 (Fig. 3) atthe discharge position A-A on the vertically movable rod 186. Theplunger 186 is slidably movable in a bushing 195 in a ledge 196 formedon the inner surface of the casing of the filling machine. A bellcrank198, pivotally mounted on a flange 199 of a bracket 200, carries aroller 201 which bears against the lower end of the plunger 186. Acompression spring 202, disposed on the lower end of the plunger betweenthe ledge 196 and a shoulder 203 formed on the plunger, maintains aconstant contact between the lower end of the plunger 186 and the roller201, and tends to turn the bellcrank 198 counter-clockwise therebypressing a roller 205, carried on the other arm of the bellcrank,against a depend-- ing ear 206 on a sleeve 207. The sleeve is slidablysupported on a stud 208 which is rigidly supported by a collar 209 onthe bracket 200. A roller bearing (not shown) is inserted within thesleeve to minimize sliding friction. The sleeve 207 carries an actuatingbracket 210 which is tightly clamped thereon. The bracket 210 is alsosupported on a horizontal flange 211 by a roller 212. A can detectorplate 213, rigidlyl secured on the upper surface of the bracket 210,extends through an opening 215 n the guide rail 216 and into the path ofthe cans C as they are moved along the can track 58. When the plate iscontacted by a can C, it is moved radially outwardly, relative to thefilling machine axis, as from the dotted line position to the full lineposition in Fig. 3. This outward movement of the plate 213 carries thesleeve 207 outwardly and causes the depending ear 206 on the sleeve topivot the bellcrank 198 clockwise about its pivot axis. As a result, therolller 201 pushes the rod 186 upwardly and moves the cam 184 into theposition wherein it will be contacted by the button end 168 of the aircontrol unit.

In Fig. 3 the coordination of the detector plate 213 with a particularcan C on the can track, the cam 184 at the discharge station A, and aparticular air control unit 153 associated with the can C isillustrated. It is to be noted that the can C has moved the detectorplate 213 radially outwardly, and that this outward movement has raisedthe cam 184 into the path of travel of the button 168 on the air controlunit 153 which, of course, is being moved in timed relation with the canC and the filling valve .-15 mounted directly above the can. It will'fbe'evident that, if for any -reason a can is not positioned underonevof-thefiliing valves, the detector plate will not be movedoutwardlywhen that filling valve arn rives-at the discharge station A-A.Consequently, the cam 184 will not be moved into the path of the buttonon :the end of the airreontrol unit associated with the valve and,accordingly, the valve will not be opened to discharge its contents.

Summarizing thev operation of the novel metering and filling valve ofthis invention, cans are moved onto the can track 58 by the star feedingmechanism 57 so that a ycan is positioned under each metering andfilling valve 15. It will be understood that each valve 15, as itapproaches the-can feeding mechanism 57, is in the valve fillingposition shown in Fig. l1. As each can C, its associated valve v15, andthe associated air control unit 153 approach the 'valve dischargeposition A--A, the can :moves the detector plate 213 outwardly to effectraising of the cam 184 into the position wherein the button 1.68 of theair control unit will Contact the cam and move the rod 163 connected tothe button radially inwardly into the housing 15S of the unit 153. Theinward movement of the rod causes air under pressure to be directed tothe upper fitting 125 of the valve and into the chamber 123 at a pointabove the annular piston 115, moving the lower valve body 112 downwardlyand permitting the seating surface 93 of the upper valve body S9 tosealingly engage the seat 87 of the valve housing 78 to trap a charge ofliquid into the valve. Further downward movement of the lower valve bodymoves the valve seat 114 away from the rubber valve member 105, as seen4in Fig. 9, and causes the charge of liquid to be discharged into thecan therebelow. When the valve reaches the valve filling position B-B(Fig. 1), the button 168 on the radially inner end of the rod 163 of theair control unit isv contacted by the fixed cam 188 which shifts the rodoutwardly to vent the airline to the fitting 125 and communicates thesource of pressurized air with the conduit 177 leading to the fitting127. Thus, at position B-B, air under pressure enters the chamber 1.23of the valve and moves the lower valve body 112 upwardly to engage therubber valve member 105 (Fig. l) and move the valve stem 98 bodilyupwardly to lift the sealing member 93 of the upper valve body 89 awayfrom the valve seat 87 to the position of Fig. ll. When the valve seat87 is opened, liquid in the annular supply trough 44 rushes into thevalve to fill it to a level corre sponding to the level of the liquid inthe supply trough, thus providing a charge of liquid in the valve whichwill be later trapped therein by the descent of the upper valve body atthe valve'discharge position A--A.

It will now be apparent that there is provided 4in the present inventiona plurality of novel, efficient, metering and filling valves which arearranged to meter substantially identical quantities of liquid, anddischarge the metered quantities into containers in timed relation withthe movement ofthe containers through the filling machine. Referring toFig. 4, it is to be particularly noted that the upper valve'body 91 maybe removed from the valve kassemblymerely kby lifting it upwardly fromits positioninside the lugs 95. The capacity of each valve may bechanged by substituting an upper valve body having a different internalvolume below the liquid level line. The dimension of the seating surface93 must, of course, be identical for all replacement upper valve bodies.The ease-of removal of the upper valve body 91 also greatly simplifiesthe problem of cleaning the valves and the associated filling machineparts.

It will beunderstood that modifications and variations maybe madewithout departing from the scope of the present invention.

Having thusdescribed myinvention, what I claim as new anddesirek toprotect byLetters Patent is:

'1. A liquid 'dispenser comprisingahousinghaving a chamber open atbothends, one open end forming an inlet port for liquids, avfirst valveseat disposed around said inlet port, a first valve adapted tolsealingly engage said first valve seat in liquid-tight engagement, acupshaped member having a side wall engagingthe inner wall of saidhousing in liquid-tight slidable engagement, the hollow interior of saidcup-shaped member combining with said chamber to form a liquid reservoirreceiving v liquid through said inlet port, means for filling saidreservoir with liquid when said inlet port is open, the bottom wall ofsaid cup-shaped member having an opening providing a discharge port forsaid reservoir, a second valve seat formed in the bottom wall of saidcup-shaped` member around said discharge port, a second valve connectedto said first valve for conjoint movement and arranged to engage saidsecond valve seat in liquid-tight engagement, and said cup-shaped memberbeing movable in said housing in one direction for consecutively movingsaid second valve seat into engagement with said second valve and movingsaid first valve away from said first valve seat permitting liquid toenter said reservoir, and said cup-shaped member being movable in theopposite direction to consecutively seat said first valve and unseatsaid second valve permitting discharge of liquid from said reservoir,means defining a power chamber between the outer wall of said cup-shapedmember and the inner wall of said housing, seal means disposed betweensaid cupshaped member and said housing and arranged to prevent thepassage of pressurized fluid from said power chamber to the interior ofsaid cup-shaped member, an annular flange disposed in said power chamberand connected to said cup-shaped member, means for directing,pressurized fiuid to said power chamber on one side of said annularflange to urge said cup-shaped member in said one direction, and meansfor simultaneously releasing the pressurized liuid on said one side anddirecting pressurized fluid to said power chamber on the other side ofsaid annular flange to urge said cup-shaped member in said oppositedirection.

2. A liquid dispenser comprising a housing having a hollow interioraffording a reservoir for liquid and having an opening in one wall, amember disposed across said opening having side walls in sliding sealingengagement with the inner walls of said housing and a bottom wall with adischarge port through which liquid may be discharged from saidreservoir, a Valve seat formed in said member around said dischargeport, a valve arranged to engage said valve seat in liquid-tightengagement, said member being movable in one direction for moving saidvalve seat into engagement with said valve and movableV in an oppositedirection to unseat said valve, means defining a power chamber betweenthe outer wall of said member and the inner wall of said housing, sealmeans disposed between said member and said housing and arranged toprevent the passage of pressurized fluid from said power chamber to theinterior of said housing, an annular ange disposed in said power chamberand connected to said member, means for directing pressurized fiuid tosaid power chamber on one side of said annular fiange to urge saidmember in said one direction, and means for simultaneously releasing thepressurized fluid on said one side and directing pressurized fluid tosaid power chamber on ythe other side of said annular fiange to urgesaid member in said opposite direction.

References Cited in the file 'of this patent UNiTl-D STATES PATENTS889,106 Cunningham May 26, 1908 2,035,898 Kniskern Mar. 31, 19362,152,870 Cannon Apr. 4, 1939 2,222,617 Hothersall et al. Nov. 26, 19462,522,898 Sanborn Sept. 19, .1950 2,575,964 `MacLean. Nov.y 20,. 5195.1

